Combined bell and buzzer



June 16, 1925. 1,541,954

H. HERSH COMBINED BELL AND BUZZER Filed Oct. 19, 1920 2 Sheets-Sheet 1 INVENTOR.

v- \v m ATTORNEY.

June 16, 1925. 1,541,954

H. HERSH COMBINED BELL AND BUZZER Fil ed on. 19, 1920 2.Shee ts -Sheet 2 m /flmia,

INVENTOR.

P Q h Patented June 16, 1925.

HERSH; OF MARINETIIE, WISCONSIN COMBINED BELL Ann BUZZER.

\ Application filed October 1 9, 1920. Serial No. 418,058.

This invention relates to a combinedfhell,

and buzzer signal. and comprises a set of three ores supported substantially parallel with each other, the neans for supporting" saidpores comprising; metallic plates to which, respectively, opposite ends ofthe center core and of different outer cores are connected, core windings, and vibrating armatures adapted to bridge the spaces be at the respective opposite ends of said cores by the supporting plates which connect said cores in pairs, the core windings being preterably distributed on all three cores and the winding of the centercore being connected in series with each otthe outer. core windings, respectively, and the windings of the outer cores being. arranged to produce a magnetic field acting in the same direction through the center core asthat produced by the windings of said center core, and usual meaus lfor completing the electric circuit through the winding ot the center core andeither of the outer cores to cause one or the other, the armatures to vibrate so that said hell or buzzer signals may he sorinded independently of each other, thereby forming in effect two separate horseshoe magnets oi each ofwhichthe center core is an element. p

In the construction of electric signals, as disclosed inthe prior artwherein a buzzer and bell areunounted in a single unit, it has heretofore been customary to employ a pair of magnets, one for the bell and one for the ems-3;, In such construction the armatures of the magnets also serve as their yolres"hence whenIeither of the magnets is energized hoth armaturesare under the influence of the magnetic field produced and must nece ssarily respond, thus tending to produce a confusion of signals.

In the present invention, 1 have provided-i. a combined bell and buzzer in which ahell' magnet and a buzzer magnet are arranged on." each side of a central magnetgthe centralmagnet, being adapted toact in conjunc; tion with either of the other; twoomagnets and form two separate; electric and mag; netic circuits. Ihe construction produces anelectric signal ofthe type described,-in which the armatures of the hell and buzzer. are in different magnetic circuits andthere= 'l'ore have no tendency to vibrate together when one of the circuits is energized.

In the accompanying drawings, 1 have shown. one embodiment of the invention. In this showing p Figure 1 is a plan view of an electric si-g;v nalling apparatus constructed in accordance with the invention,

Figure 2 is a longitudinalsectional View through the apparatus showinga cover in position thereon,

Figure Bis ,a. transverse sectional View on line3 3of FigureQ, v y

Figure 4 is a diagrammatic view illustrating the windings and circuits,-

Figure 5 is a detail perspective 'Vl6W of a plat-eemployed to. support the magnets,

' Figure 6 is a; detail view of one endof a mcdifiedfform ot'p'1ate,v

Figure 7 is a similar View of another modification, and, N

Figure 8. is a detail. perspective View showing one manner of mounting the hell on the base. 1

Referring to the drawings,'the'referencenumeral 1 designates a base on which the. instrument is mounted. Plates 2 are,arranged on the base and are adapted toform" supports forthe magnets. The detail construction of one of the supporting-plates is shown in Figure 5 of thed-rawings. As shown, it comprises a base portion 3, 1131 ing flanged ends 4 and 5. The base tion is arranged at anfang-le, whereby the." sides of the plate are notin transverse alinement-with each other, thelower end ofthe v plate 5 being arranged in 'ali-nement wit= ln the up aer end of the plate 4.; An openingi G isarranged the upper endof the plate at ,and a similar opening? is arranged in alinement therewith in the lower end of plate 5. The center magnet 8 is supported in the flanges 4 and 5, the ends of the magnet being arranged in openings 6 and 7. The magnet is provided with a core 9, supported in said plates, and provided with winding 10, of suitable wire.

Magnets 11 and 12 are arranged on each side of the center magnet, one end of each of the magnets being supported by the flanges 4 and 5, respectively.

Referring to Figure 3 of the drawings, the opposite ends of the magnets 11 and 12 support substantially U-shaped clips 13. As shown, a block of insulating material 14 is arranged on one side of the vertical arm 15 of the clip and a similar block 16 is arranged on the opposite side of the vertical arm. Suitable fastening means are passed through openings in these blocks and the clip and received in the end of the magnet whereby the clip is secured to, and insulated from the magnet core. The other arm 17 of the clip forms the contact member operating in conjunction with the armature to be described. The insulating block 16 extends slightly beyond the end of the magnet core and serves to prevent the armature 18 from sticking to the core on account of residual magnetism as it might do if it could come into, direct contact with the end of the core.

Armatures 18 and 19 are arranged on each side of the magnets. The armatures are secured to spring members 20 and 21, respectively, the spring members being supported between insulating blocks 22, carried by the flanges 4 and 5.

Referring to Figures 5 to T of the drawings, the insulating blocks are provided with an opening 23, adapted to be arranged in alinement with an opening 24, in the flange. A screw 2? (see Figure 1) is passed through these openings to secure the blocks and spring member in position and to support the magnet 11 or 12. The body of the screw has no electrical connection with the spring member and the head is substantially insulated from it by insulating block 22. This feature is of great importance as it serves to separate the electric circuits of the bell and the buzzer, and also to insulate the base of the instrument from the two circuits. In the form of the invention shown in Figure 5 of the drawings, the upper edge of the flange is provided with a pair of projections 26, adapted to engage the edge of the insulating block to prevent it from rotating. In the form of the invention shown in Figure 6 of the drawings, the edge of the plate is bent over, as at 27, to prevent rotation of the block. In Figure 7 of the drawings, I have shown another means for accomplishing this purpose,

wherein lips 28 are struck up from the body portion of the plate and adapted to engage the side of the insulating block and retain it in proper position. Any other suitable means may be employed for performing this function.

The spring members 20 and 21 to which the armatures are secured are provided with lips or projections 29 on their inner ends, arranged at right an les to the body portion of the spring mem er and adapted to engage the side of the insulating block 22, to maintain the spring members in proper position (see Figure 5).

The armatures are secured to the spring members by any suitable means. As shown, rivets 30 are employed for this purpose. Beyond the point where the armature is secured to the spring, the end of the spring is off-set, as at 32, the terminal 33 being arranged adjacent to the vertical arm 17 of the U-shaped clip 13. A screw 34 may be arranged in the vertical arm to permit adjustment in the usual manner. The armature 19 extends upwardly, and is provided with a bell clapper 35, arranged adjacent a bell 36. In the form of the invention shown in Figures 1 to 4 of the drawings, the bell member is supported on a post 37, being retained thereon by a screw 38. In Figure 8 of the drawings, I have disclosed another means for supporting the bell. As shown, the base I is provided with a struck out portion 39, which is bent upwardly and provided with a flattened te"- minal 40. The member 39 may be ribbed, as at 41, to add to its strength and rigidity. The bell is adapted to be arranged on the flattened terminal and may be secured thereto in any suitable manner, as by means of a rivet or screw.

In Figures 2and 30f the drawings,I have shown a cover 40, in position totally enclosing all parts of the mechanism including the terminals, bell member and clappe thereby safeguarding the mechanism against accidental short circuiting of terminals, protecting itagainst mechanical injury and preventing the collection of dirt and grime on the terminals or the bell and clapper members.

Referring to Figure 4 of the drawings, the circuits employed in connection with the invention are illustrated therein. A source of current 42 is provided with lead wires 43 and 4.4. The lead wire 44 is provided with a branch 45, leading to a switch 46. A switch. 47 is arranged in the wire 44 beyond the junction of the wires 44 and 45. Any suitable type of switch may be employed in connection wit-h the invention, the usual type being the ordinary push button. The wires 43, 44, and lead to terminals 48, 49, and 50, respectively, arranged on the base of the bell as shown in Figure 1. The central terminal 48 is connected to the central magnet by means of a connection 51. The winding 52 of the central magnet is conneetedto the magnet 11 by a connection 53, and is carried back under the windings to the other end of the magnet, as at 54, and connected to the winding of the magnet 12, as at 55. The magnets 11 and 12 are provided with windings 56 and 57 respectively, and the ends of these windings are connected to the vertical legs 17, forming the contact tips by connections 58 and 59, respectively. The terminal 50 is connected to the spring member 20 by a connection 60, and the terminal 49 is similarly connected to the spring member 21 by a connection 61.

The operation of the device is as follows:

lVhen the switch 46 is closed and the switch 47 is open, current passes from the battery 42 or other source of current, through wire 45 to terminal 50, thence to spring member 20 of the armature 18, through connection 60. From the end of the spring member, the current passes to the contact clip, and thence to winding 57 of the electro-magnet 12, through connection 59. From the magnet winding, the current passes to the center magnet through connection and, after passing through the winding of the center magnet, the current passes through connection 51 to terminal 48, thence to the battery through the wire 43. When this circuit is established, the cores of the center magnet and magnet 12 are energized, and the armature 18 is vibrated, the circuit being alternately closed and opened by the vibration of the armature and causing the end of the sprin member 20 to engage the vertical arm 17 to produce a buzzing effect in the usual manner. I

When the switch 47 is closed and switch 46 is opened, current passes through wire 44 to terminal 49, thence to the spring member 21 through connection 61, the spring member being normally in engagement with the vertical arm 17 of the contact clip, current is transmitted through connection 58 to the winding 56 of magnet 11, and thence to the center magnet through connection 53. From the winding of the center magnet, the current passes through connection 51 to terminal 48 in the manner heretofore described. It will thus be apparent that when the switch 47 is closed, the cores of the center magnet and magnet 11 are energized and armature 19 vibrated to ring the bell 36 in the usual manner.

If both switches 46 and 47 are closed at the same time, the two circuits just described are completed and the bell and buzzer are operated at the same time.

The side plates 4 and 5 may be provided with slots 62 (see Figure 7) to make the poles of the center magnet more pronounced by minimizing the tendency of magnetic fluxes from the center magnet taking a path through the yoke and core of the inactive outer magnet. V 1

By means of the construction above described, a combined bell and buzzer is produced in which, when the magnet unit which controls one of the armatures is energized, it will have no tendency to energize the other magnet unit nor to cause vibration of the armature controlled thereby, thus providing a combined bell and buzzer signal which possesses all of the electrical, magnetic and mechanical advantages of separate bells and buzzers operated by horseshoe types of magnets.

The bell and buzzer herein shown and described constitute what I now consider to be the preferable embodiment of my invention. I do not, however, desire to limit myself thereto, as my invention admits of a considerable range of modification and embodiment in diiierent forms which, in View of my disclosure, will readily suggest themselves to persons skilled in the art. For example, instead of distributing the core windings on all three cores, the wind ings may be concentrated on the outer cores only, the center core serving only as a path for the magnetic fields of the outer magnets; also, instead of formim the plates or yokes 4 and 5 integral with a common supporting plate 3, my invention contemplates equally the use of separate supporting plates 4 and 5.

Having thus described my invention, I claim:

1. An electric signalling apparatus comprising a bell and buzzer signal and an electro-Inagnet adapted for separately operating said bell and buzzer, said electromagnet comprising three cores supported substantially parallel with each other, the means for supporting said cores comprising metallic plates of magnetic material to which, respectively, opposite ends of the center core and of different outer cores are connected, core windings and vibrating armatures adapted to bridge the spaces between said center core and the unsupported ends of the outer cores which are bridged at the respective opposite ends of said cores by the supporting plates which connect said cores in pairs, and said magnetic plates being connected by a plate at one side of at least a portion of all of the windings, whereby in effect two separate horseshoe magnets are formed of each of which the center core is an element, substantially as described.

2. An electric signalling apparatus as specified in claim 1, in whichthe core Windings are distributed oii all tlir cbies, and

the winding of the center core is coniiected in series with the windings of the Outer cores, respectively, and the winding-s of the outer cores are m r zihged t0 pi'kiduc e 2i mag netic field acting through the center core in the same direction as the n'ia g'nefii'c field produced by the windings of said center coi e, gubsi'zi-iii'iziny 4's described.

lii te'fsciihohy whereof I ziffizi my signatu're I HARRY HERSH.

WVit nes's:

EMIL H iiSI-I, HATTHE BUEHLER. 

